/Engine/Source/Runtime/RHI/Public/GPUDefragAllocator.h
Tries to immediately grow a memory chunk by moving the base address, without relocating any memory.
nullptr if it failed, otherwise the new grown chunk
[FMemoryChunk](API\Runtime\RHI\FGPUDefragAllocator\FMemoryChunk) * Grow ( [FMemoryChunk](API\Runtime\RHI\FGPUDefragAllocator\FMemoryChunk) * Chunk, int64 GrowAmount )